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Patent US3389938A successfully refreshed from Google Patents.
US3389938A
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US
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Closed circuit slurrifier
Assignee: Individual
•
Filing: 1966-08-15
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Granted: 1968-06-25
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Expires: 1986-08-15
Abstract
No abstract record available.
Inventors
- 👤 David M Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:05
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3159431A
Cited
GB110609A
Cited
US1444421A
Cited
US2404937A
Cited
US2727792A
Cited
US2915336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |